Now that we know that Sigma is not afraid of sticking a honking huge lens on the front of a DP, this might actually be feasible.

What would be ultra cool about this concept is if they would find a way to make it tilt-shift without requiring any additional manual levers or adjustments on the outside of the lens, but keep the control in software. I think more nobs on the camera would turn off potential buyers who just want simple and straight-forward control.